(1311) Knopfia Main-belt Asteroid
Discovered on 24 March 1933 by K. Reinmuth at Heidelberg.
Where Knopfia is today
Seen from above the solar system on 2026-10-14: Knopfia is 2.36 au from the Sun and 2.03 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1311 |
| Provisional designation | 1933 FF1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.94 km (#5,134 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0990 |
| Rotation period | 19.3 hours |
| Absolute magnitude (H) | 12.43 |
| Orbital period | 3.78 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 2.32 – 2.53 au |
| Eccentricity | 0.0435 |
| Inclination | 2.83° |
| Closest distance between its orbit and Earth's (MOID) | 1.34 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.